Republican Kentucky Sen. Rand Paul urged President Trump to remove former national security adviser John Bolton’s security clearance in a Saturday morning tweet.

“No one, especially not John Bolton, should be able to use their security clearance for profit! I say revoke his clearance now ⁦@realDonaldTrump.”

Those words were accompanied by a RealClearPolitics article detailing why Bolton’s security clearance could be in jeopardy once the impeachment trial has concluded. The article states that the removal of Bolton’s clearance is an “almost certainty,” according to two anonymous government officials.

The senator has been a staunch critic of Bolton's foreign policy ideas, which the Kentucky senator has called "naive," and he also criticized the former ambassador in a tweet a few days ago.

“Why didn’t John Bolton testify to the US House? Apparently his book wasn’t quite finished yet for presales!” Paul tweeted.

Bolton’s book, which many believe contains damaging information about President Trump, is currently in the manuscript phase, and it was reported that Bolton received a $2 million advance.

In the late summer of 2018, just a few months into John Bolton’s national security adviser tenure, he strongly defended President Trump’s decision to revoke the security clearance of former CIA Director John Brennan, the pugnacious anti-Trump critic the president has called a “leaker,” “a liar” and ringleader of the debunked Russian collusion investigation.

At the time, Bolton accused Brennan of “politicizing intelligence,” both during the Obama administration and afterward, which he deemed a “very dangerous thing to do.”

“If there is any kind of misconduct, I think there are lots of grounds to have your security clearance revoked for behavior that calls into question your ability to hold the material in confidence,” Bolton told ABC News’ Martha Raddatz. “…For me, the issue is whether he abused information that he attained while he was director of the CIA or he may have attained erroneously or incorrectly after he left.”

Nearly a year and a half later, the shoe is on the other foot.

Bolton left the White House in September 2019 in a public eruption of vitriol on both sides over the terms of his departure. He said he resigned; Trump says he fired the longtime national security hawk over foreign policy differences. More recently, Trump accused Bolton of trying to entangle the U.S. in multiple additional wars instead of ending them as the president had promised voters in 2016 he would do.

Bolton now faces the wrath of not just Trump but his legions of loyalists for volunteering to testify against the president in the impeachment trial, thus bolstering Democrats’ arguments that the president threatened Ukraine’s president with a quid pro quo over U.S. aid to extract a commitment to investigate Joe Biden and his son’s dealings in that country.

Seeing his security clearance revoked is an almost certainty for Bolton once the impeachment trial is over, according to two government officials who spoke on condition of anonymity, as well as legal experts – all of whom say Bolton could face additional fallout for his role in the impeachment drama this week.

Several media outlets have reported that the irascible veteran national security official circulated a draft manuscript of the book containing the quid pro quo arguments to close associates before delivering it to the White House Records Management Directorate for pre-publication review, as required, and could face criminal prosecution if proof he did so surfaces.

“If your manuscript includes classified information, then you’re committing a felony by passing it around,” a former White House official told RealClearPolitics.

Bolton has denied leaking the book excerpts, insisting in a statement that “there was absolutely no coordination with the New York Times or anyone else regarding the appearance of information about this book.”

Anyone with ties to Bolton who remains on the National Security Council, along with other aides who testified in the House impeachment trial, such as Lt. Col. Alexander Vindman (and his twin brother, who also serves on the NSC), are bracing for removal.

President Trump’s national security adviser, Robert O’Brien, has made no secret of his plans to drastically downsize the executive council to its lowest staffing in nearly 20 years, arguing in a Washington Post op-ed that the council had “ballooned” under President Obama (George W. Bush had half as many staff members). Some 60 to 70 aides who are set for removal would go back to their home agencies, O’Brien told NPR, bringing the staffing total to just over 100.

The burgeoning size of the NSC has had plenty of critics in Washington over the last decade. The downsizing effort is also aimed at plugging leaks such as the one that led to the impeachment charges against Trump, a former White House official told RCP.

News of the book’s contents rocked the impeachment trial this week with leaks that it contained an alleged August conversation in which Trump told Bolton he wanted to withhold hundreds of millions of dollars in security aid from Ukraine until the country’s leaders agreed to investigate Joe and Hunter Biden’s dealings there.

Trump and his loyalists denounced the leaks as a craven attempt at revenge by an ousted administration official while simultaneously trying to boost book sales.

Bolton, Trump tweeted earlier this week, was “fired because frankly, if I listened to him, we’d be in World War Six by now.”

Trump claimed the former top aide “begged” me for a non-Senate approved job and then “IMMEDIATELY [wrote] a nasty & untrue book.”

“All Classified National Security. Who would do this?” Trump concluded.

Until Sunday, the book’s publisher, Simon & Schuster, refused to confirm its existence, even among reports that Bolton received a $2 million advance for writing it. Leaks to the New York Times about the alleged Ukraine revelations came the same day a pre-order notice for it was posted on Amazon.